title: [Changes in the intestines of obstetrical toad (Alyte obstetrician) larvae during spontaneous metamorphosis or metamorphosis induced by thyroxine. Morphometric study and changes in the protein/DNA ratio].
abstract: During spontaneous metamorphosis of Alytes obstetricans tadpoles (Anuran Amphibia), the gut undergoes important modifications. The gut weight/total weight and gut length/body length decrease by stage XVIII. They reach maximum reductions of 83 and 90%, respectively, by stage XXIII. Tail regression begins only by stage XX. The intestinal protein/DNA ratio peaks to a maximum by stage XIX, decreases greatly by stage XX then increases slightly by stage XXII. During thyroxine-induced metamorphosis, the morphometric changes are observable after a lag period of 36-48 hs, prior to detectable tail reduction. The intestinal protein/DNA ratio of T4-treated tadpoles remains constant and no difference with control data is noted.
mesh_terms: D000818:Animals; D001001:Anura / Q000254:growth & development* / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D007413:Intestinal Mucosa / Q000378:metabolism; D007422:Intestines / Q000254:growth & development*; D007814:Larva / Q000254:growth & development / Q000378:metabolism; D008675:Metamorphosis, Biological / Q000187:drug effects; D011506:Proteins / Q000378:metabolism; D013974:Thyroxine / Q000494:pharmacology
chemical_list: D011506:Proteins; D004247:DNA; D013974:Thyroxine
vernacular_title: Remaniements de l'intestin des larves du crapaudaccoucheur (Alytes obstetricans) lors d'une métamorphose spontanée ou induite par la thyroxine. Etude morphométrique et évolution du rapport protéines/ADN.